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Updated: Jul 7, 2026
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Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
Published on: March 1, 2019
LASP1, a Novel Protein in Spermatozoa and Acrosome Reaction
Alicia Bender1, Kilian Andress1, Michael R Boesl2
1Institute for Experimental Biomedicine II, University Hospital Würzburg, Würzburg, Germany.
Molecular Reproduction and Development
|July 6, 2026
Summary
The scaffold protein LASP1 is crucial for mammalian fertilization. Loss of LASP1 in mice impairs sperm capacitation and reduces fertilization success, highlighting its reproductive role.
Area of Science:
- Reproductive Biology
- Cell Biology
- Biochemistry
Background:
- LIM and SH3 protein 1 (LASP1) is an actin-associated scaffold protein.
- Reproductive defects are observed in Lasp1-knockout mice, and LASP1 is highly expressed in spermatids.
- Mammalian fertilization involves complex signaling pathways including PKA, PKG, Ca2+, and MAPK.
Purpose of the Study:
- To investigate the role of LASP1 in mammalian spermatozoa and fertilization.
- To examine LASP1 expression and localization in human and mouse sperm.
- To determine the functional impact of LASP1 on sperm capacitation and fertilization.
Main Methods:
- Immunofluorescence microscopy to detect LASP1 localization in spermatozoa.
- Analysis of sperm capacitation markers and protein phosphorylation in wild-type and Lasp1-knockout mice.
- Assessment of hyaluronan receptor expression and sperm-egg interaction.
Main Results:
- LASP1 is present in the head, midpiece, and tail of human and mouse spermatozoa.
- LASP1 dynamically changes during capacitation, co-localizes with F-actin, and stabilizes the equatorial ring.
- Lasp1-knockout mice exhibit altered protein phosphorylation, incomplete capacitation, and reduced hyaluronan receptor expression.
Conclusions:
- LASP1 plays a novel and essential role in sperm capacitation and fertilization.
- LASP1's function is linked to regulating protein phosphorylation and hyaluronan receptor expression during sperm maturation.
- Targeting LASP1 may offer new strategies for fertility treatments or diagnostics.
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